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Analog Devices Inc./Maxim Integrated MAX6346XR42-T
- Part No.:
- MAX6346XR42-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6346XR42-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,776
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Product details
Overview
MAX6346XR42-T from Maxim Integrated is a precision active-low push-pull microprocessor supervisory circuit that monitors VCC and asserts RESET when supply voltage falls below 4.200V (±2.5% over temperature), with guaranteed reset assertion down to VCC = 1.2V, 100ms minimum timeout after power-up, and ultra-low 1µA max supply current - used in battery-powered controllers and portable instrumentation for reliable brownout protection.
For engineers reviewing the MAX6346XR42-T datasheet, MAX6346XR42-T pinout, MAX6346XR42-T application, or MAX6346XR42-T equivalent, this page delivers verified electrical parameters, SC70-3 package details, reset threshold hysteresis (9.5mV), transient immunity data, and validated alternative parts for µP reset design validation and BOM optimization.
Technical Context
The MAX6346XR42-T implements a precision bandgap-based reset comparator with factory-trimmed 4.200V threshold (±1.5% at +25°C, ±2.5% over –40°C to +85°C), 40ppm/°C tempco, and 9.5mV hysteresis to prevent chatter during slow VCC recovery. Its push-pull output drives low actively and high actively without external pull-up.
It operates across full VCC range of 1.2V–5.5V, ignores transients ≤20µs at 100mV overdrive, and guarantees correct state down to 1.2V - enabling use in deep-brownout scenarios where µP core logic remains functional but I/O may be unstable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.200V ±2.5% over –40°C to +85°C - ensures deterministic reset activation at defined supply sag level for 3.3V/5V systems |
| Supply Current | 1.0µA max at +25°C - enables multi-year operation on coin-cell batteries in portable monitoring devices |
| Reset Timeout | 100ms minimum after VCC rise above threshold - satisfies µP power-on initialization timing requirements |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor and supports direct drive of µP RESET pin |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and compatibility with 1.8V–5V logic families |
| Reset Hysteresis | 9.5mV - prevents oscillatory reset assertion near threshold during noisy or slowly recovering supplies |
| Transient Immunity | Rejects VCC glitches <20µs at 100mV overdrive - avoids false resets from switching noise or ESD-induced dips |
Pinout & Package
MAX6346XR42-T is housed in a 3-pin SC70-3 package (outline 21-0075, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (marked "FZBE").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 | RESET | Active-low push-pull output; sinks ≥1.6mA at 0.3V (VCC > 2.1V) and sources ≥500µA at 0.8·VCC - directly interfaces µP RESET input |
| 3 | VCC | Power supply input; accepts 1.2V–5.5V; includes internal ESD protection (±2kV HBM); rate-of-rise limited to 100V/µs |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.200V with ±1.5% tolerance at +25°C - eliminates manual calibration and reduces BOM count vs. adjustable solutions |
| Ultra-low quiescent current | 1.0µA max - extends battery life in always-on sensor nodes and handheld test equipment |
| Guaranteed operation down to 1.2V | Ensures valid reset state even during severe brownout - critical for fail-safe shutdown in industrial controllers |
| Push-pull output architecture | Eliminates external pull-up resistor and associated board space, leakage, and timing uncertainty |
| SC70-3 footprint compatibility | Shares land pattern with MAX809/MAX810 - enables drop-in replacement in existing designs without layout change |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG and pulse oximeter units requiring continuous operation and safe shutdown on low battery. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and triggers controlled µP reset before memory corruption or analog front-end instability occurs. Use Value: 1µA max ICC preserves battery runtime; 4.200V threshold aligns with Li-ion discharge knee; 100ms timeout meets ARM Cortex-M boot sequence requirements. |
Use Scenario: DIN-rail mounted I/O expansion modules exposed to 24VDC field supply fluctuations and EMI. IC Role / Device Role / Timing Role: Monitors isolated 5V logic supply derived from 24VDC, asserting RESET during bus dips or hot-swap transients. Use Value: 9.5mV hysteresis prevents chatter on noisy rails; 100V/µs dV/dt rating tolerates fast-coupled noise; SC70 package fits dense PCB layouts. |
| Smart Energy Meters | Automotive Body Control Units |
Use Scenario: ANSI C12.20-compliant electricity meters with dual-supply (3.3V MCU + 1.8V RTC) and tamper detection circuits. IC Role / Device Role / Timing Role: Resets metering SoC when main supply sags below 4.2V during load switching or grid anomaly. Use Value: ±2.5% threshold tolerance over –40°C to +85°C ensures consistent behavior across outdoor temperature extremes; no external components reduce failure modes. |
Use Scenario: 12V automotive subsystems (e.g., door module) powered via LDO-regulated 5V rail subject to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Provides clean reset signal to Infineon AURIX™ MCU during ignition cycle transitions and battery voltage recovery. Use Value: Valid operation down to 1.2V supports reset assertion during cold-crank (≤6V battery); push-pull output drives heavy capacitive loads without delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | 4.38V reset threshold (±2.5%), SOT23-3, 1.2µA max ICC, open-drain output | Requires external pull-up; less suitable for high-capacitance RESET lines or noise-sensitive µPs | Select when open-drain flexibility is needed for wired-OR reset buses or level translation |
| TPS3808G33DBVR | 3.3V threshold, 1.8µA ICC, push-pull, 200ms timeout, wider VCC range (0.8–6.0V) | Longer timeout may delay µP startup; higher ICC impacts ultra-low-power designs | Prefer for TI-based platforms needing longer reset hold time or sub-1.2V operation |
Compared with MAX6346XR42-T, MAX809TRD3-T requires external biasing and offers lower noise immunity due to open-drain structure, while TPS3808G33DBVR trades precision threshold and ultra-low ICC for extended VCC range and longer timeout - making MAX6346XR42-T optimal for compact, battery-constrained 4.2V-monitoring applications.
Availability
MAX6346XR42-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6346XR42-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability, integration, and low-power operation.
The MAX63xx family targets cost-sensitive, space-constrained µP supervision needs in portable, industrial, and instrumentation systems - delivering factory-trimmed accuracy without external components.
FAQ
What is the exact reset threshold voltage of MAX6346XR42-T and how does it vary with temperature?
The MAX6346XR42-T has a nominal reset threshold of 4.200V at +25°C, with ±1.5% tolerance at room temperature and ±2.5% over the full –40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, resulting in a maximum deviation of ±10.5mV across the temperature range - sufficient for stable operation in industrial environments where supply rails drift predictably.
Does MAX6346XR42-T require an external pull-up resistor on its RESET pin?
No, MAX6346XR42-T features a push-pull output that actively drives both high and low states, eliminating the need for an external pull-up resistor. It sources ≥500µA at 0.8·VCC when high and sinks ≥1.6mA at ≤0.3V when low - enabling direct connection to µP RESET inputs without additional components or timing uncertainty.
Can MAX6346XR42-T operate reliably during cold-crank conditions in automotive applications?
Yes, MAX6346XR42-T guarantees correct reset state down to VCC = 1.2V and operates across 1.2V–5.5V, making it suitable for automotive cold-crank (battery dip to ~6V) when powered from a post-LDO 5V rail. Its 100ms minimum reset timeout and 9.5mV hysteresis ensure robust response to slow-recovering supplies typical in vehicle electrical systems.
What package type and footprint does MAX6346XR42-T use, and is it compatible with standard reflow profiles?
MAX6346XR42-T uses the SC70-3 package (2.0mm × 2.1mm × 0.95mm, outline 21-0075), with gull-wing leads and lead-free finish. It is compatible with standard Pb-free reflow profiles (J-STD-020), including peak temperatures up to +260°C for 30 seconds, and has a moisture sensitivity level (MSL) of 1 - allowing uncomplicated assembly in high-volume manufacturing.
How does MAX6346XR42-T handle fast transients on the VCC line?
MAX6346XR42-T rejects fast negative-going VCC transients up to 20µs in duration when the overdrive (VTH – VCC) is 100mV, per the Typical Operating Characteristics graph. Its internal comparator includes filtering to ignore glitches shorter than this threshold - preventing spurious resets caused by switching regulator noise or ESD coupling on the supply rail.
MAX6346XR42-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6346XR42-T FAQ
1.How can I place an order for MAX6346XR42-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346XR42-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6346XR42-T reliable?
The price and inventory of MAX6346XR42-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346XR42-T is usually 5 days.
3.What payment methods are accepted for MAX6346XR42-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346XR42-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346XR42-T?
MAX6346XR42-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346XR42-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6346XR42-T?
For technical support, including MAX6346XR42-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346XR42-T requirements.
6.How does Aetrix verify that MAX6346XR42-T is sourced from the original manufacturer or authorized distributors?
All MAX6346XR42-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6346XR42-T meets industry standards.
7.What is the process for return or replacement of MAX6346XR42-T?
All MAX6346XR42-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346XR42-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6346XR42-T part is unused and in its original packaging.
Return procedure for MAX6346XR42-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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